I am trying to upgrade the firmware on a GXV3240 with an SD card. The phone is currently on firmware: 1.0.3.92

I format the SD card with NTFS and place the firmware bin file for 1.0.3.207 on the card. The bin file is the only file on the SD Card.

I insert the card into the phone, reboot, and hold the * and 3 key down and the phone goes into update mode and begins the update but eventually fails. I then remove the SD card from the phone and reboot the phone.

I put the SD card back in my computer and it is now unreadable and must be formatted.

I have tried both the latest firmware file for the 3240 and the next sequential firmware version 1.0.3.131 with the same failed result.

If anyone can give me some guidance on what I might be doing incorrectly please let me know.